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首页> 外文期刊>International Journal of Electrochemical Science >Cyclic Voltammetry for Synthesizing Carbon Supported Pt-Cu Alloy with Superior Oxygen Reduction Activity
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Cyclic Voltammetry for Synthesizing Carbon Supported Pt-Cu Alloy with Superior Oxygen Reduction Activity

机译：循环伏安法合成具有优异氧还原活性的碳载Pt-Cu合金

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Cyclic voltammetry (CV) was used to fabricate carbon supported Pt-Cu alloy (Pt-Cu/C) for oxygenreduction reaction (ORR) at ambient temperature. A flowerlike structure of Pt-Cu nanoparticles wereanalyzed by scanning electron microscopy and X-ray photoelectron spectroscopy was used to confirmthe surface chemical composition and metallic state. And, electrochemical measurements such as CV,rotating disk electrode, rotating ring-disk and electrochemical impedance spectroscopy were applied toobtain the kinetic constants and the reaction mechanisms of the ORR. Compared with Pt/C, Cu/C, Pt- Cu/C exhibits the highest efficient catalytic activity for ORR, as evidenced by the highest currentdensities of the polarization curves, lowest onset oxidation potential and charge transfer impedance.The average electron transfer number and hydrogen peroxide calculated from RRDE are about 3.87and 6.71%, respectively. These results show that the synthesized Pt-Cu/C has excellent electrocatalyticactivity and the ORR is a four-electron dominant reduction pathway.
机译：循环伏安法（CV）用于制造碳载Pt-Cu合金（Pt-Cu / C），用于在环境温度下进行氧还原反应（ORR）。通过扫描电子显微镜分析了Pt-Cu纳米粒子的花状结构，并利用X射线光电子能谱确定了表面化学成分和金属态。并通过电化学测量，如恒压，转盘电极，转环盘和电化学阻抗谱等方法，获得了ORR的动力学常数和反应机理。与Pt / C，Cu / C相比，Pt-Cu / C对ORR表现出最高的催化活性，这由极化曲线的最高电流密度，最低的起始氧化电位和电荷转移阻抗证明。根据RRDE计算得出的过氧化氢分别约为3.87％和6.71％。这些结果表明，合成的Pt-Cu / C具有优异的电催化活性，ORR为四电子显性还原途径。

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